Add new Jira pages, update old locations

• Link to the merge request of the new page:

• Give the MR a descriptive title.

• Link to the merge request that introduced the new page.

  • gitlab#324250 (closed) is the overarching work
  • gitlab!57406 (merged) for the page that moved
  • gitlab!57410 (merged) split DVCS info off to a new page
  • gitlab!57493 (merged) split app info off to a new page

Related to gitlab#324250 (closed)